Crossword Genius

Backs up, having lost a kilo with dried, crusty skin (4)

Ross

I believe the answer is:

scab

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'skin' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for scab that I've seen before include "Rat" , "Ignorer of strike" , "Crust on wound, or a blackleg" , "He's not out" , "that blocks cut" .)

I've seen this clue in The Irish Times.
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